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Overwrite glyphs contour count if it's less than -1.

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The test pdf has a contour count of -70, but OTS doesn't
like values less than -1.

Fixes issue #7562.
This commit is contained in:
Brendan Dahl 2017-10-29 19:07:02 -07:00
parent 56c14e27e6
commit 17037b5e51
4 changed files with 17 additions and 2 deletions
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12
src/core/fonts.js
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@ -649,6 +649,11 @@ var Font = (function FontClosure() {
return (b0 << 8) + b1;
}
function writeSignedInt16(bytes, index, value) {
bytes[index + 1] = value;
bytes[index] = value >>> 8;
}
function signedInt16(b0, b1) {
var value = (b0 << 8) + b1;
return value & (1 << 15) ? value - 0x10000 : value;
@ -1577,8 +1582,11 @@ var Font = (function FontClosure() {
return glyphProfile;
}
var glyf = source.subarray(sourceStart, sourceEnd);
var contoursCount = (glyf[0] << 8) | glyf[1];
if (contoursCount & 0x8000) {
var contoursCount = signedInt16(glyf[0], glyf[1]);
if (contoursCount < 0) {
// OTS doesn't like contour count to be less than -1.
contoursCount = -1;
writeSignedInt16(glyf, 0, contoursCount);
// complex glyph, writing as is
dest.set(glyf, destStart);
glyphProfile.length = glyf.length;